diff --git a/streecmp.a b/streecmp.a
new file mode 100644
index 0000000..9eacb54
Binary files /dev/null and b/streecmp.a differ
diff --git a/streecmp.c b/streecmp.c
index 5d8c5f0..67634e7 100644
--- a/streecmp.c
+++ b/streecmp.c
@@ -51,31 +51,35 @@ struct nod *mknod(struct nod *nod, int loc) {
     return nod->pool[loc];
 }
 
-int mkstr(struct nod *nod, char *str, int val) {
-    struct nod *target = nod->pool[*str];
+int mkstr(struct nod *nod, char *str, int val, int flag) {
+    char ch = (flag & LOOSE_CHECK)  &&
+              (*str >= 'a')         && 
+              (*str <= 'z')         ? *str-32 : *str;
+
+    struct nod *target = nod->pool[ch];
     if (target != NULL) {
         if (*str == '\0') {
             return 0;
         }
 
-        return mkstr(target, str+1, val);
+        return mkstr(target, str+1, val, flag);
     }
 
-    struct nod *new = mknod(nod, *str);
+    struct nod *new = mknod(nod, ch);
     if (new == NULL) {
         return -1;
     }
 
-    new->val.cval = *str;
+    new->val.cval = ch;
     if (*str != '\0') {
-        return mkstr(new, str+1, val);
+        return mkstr(new, str+1, val, flag);
     }
 
     new->val.ival = val;
     return val;
 }
 
-int gentree(struct nod *nod, char *strs, char *delim) {
+int gentree(struct nod *nod, char *strs, char *delim, int flag) {
     strs_cnt = 1;
     
     char *strs_cpy = strdup(strs);
@@ -89,7 +93,7 @@ int gentree(struct nod *nod, char *strs, char *delim) {
 
     for (char *tok = strtok(strs_cpy, delim); tok != NULL; tok
             = strtok(NULL, delim)) {
-        int ret = mkstr(nod, tok, strs_cnt);
+        int ret = mkstr(nod, tok, strs_cnt, flag);
         if (ret < 0) {
             goto _err_mkstr;
         }
@@ -105,8 +109,12 @@ _err:
     return -1;
 }
 
-int streecmp(struct nod *nod, char *str) {
-    struct nod *target = nod->pool[*str];
+int streecmp(struct nod *nod, char *str, int flag) {
+    char ch = (flag & LOOSE_CHECK)  &&
+              (*str >= 'a')         && 
+              (*str <= 'z')         ? *str-32 : *str;
+
+    struct nod *target = nod->pool[ch];
     if (target == NULL) {
         return 0;
     }
@@ -115,21 +123,22 @@ int streecmp(struct nod *nod, char *str) {
         return target->val.ival;
     }
 
-    return streecmp(target, str+1);
+    return streecmp(target, str+1, flag);
 }
 
-int streencmp(struct nod *nod, char *str, int len) {
+int streencmp(struct nod *nod, char *str, int len, int flag) {
     struct nod *nptr = nod;
-    char *sptr = str;
+    for (char *sptr = str; sptr < str+len; sptr++) {
+        char ch = (flag & LOOSE_CHECK)  &&
+                  (*sptr >= 'a')        && 
+                  (*sptr <= 'z')        ? *sptr-32 : *sptr;
 
-    for (int i = 0; i < len; i++) {
-        struct nod *target = nptr->pool[*sptr];
+        struct nod *target = nptr->pool[ch];
         if (target == NULL) {
             goto _not_found;
         }
 
         nptr = target;
-        sptr++;
     }
     
     nptr = nptr->pool['\0'];
diff --git a/streecmp.h b/streecmp.h
index 6d35e0d..67d00e6 100644
--- a/streecmp.h
+++ b/streecmp.h
@@ -4,6 +4,8 @@
 #define POOL_SIZE 256
 #define DEF_DELIM "\n"
 
+#define LOOSE_CHECK 0b00000001
+
 struct nodval {
     int ival; 
     char cval;
@@ -18,9 +20,9 @@ struct nod {
 void frenod(struct nod *nod);
 struct nod *allocnod(void);
 struct nod *mknod(struct nod *nod, int loc);
-int mkstr(struct nod *nod, char *str, int val);
-int gentree(struct nod *nod, char *strs, char *delim);
-int streecmp(struct nod *nod, char *str);
-int streencmp(struct nod *nod, char *str, int len);
+int mkstr(struct nod *nod, char *str, int val, int flag);
+int gentree(struct nod *nod, char *strs, char *delim, int flag);
+int streecmp(struct nod *nod, char *str, int flag);
+int streencmp(struct nod *nod, char *str, int len, int flag);
 
 #endif
diff --git a/test.c b/test.c
index 7a5fcfb..87ea936 100644
--- a/test.c
+++ b/test.c
@@ -127,7 +127,7 @@ int main(void) {
         return -1;
     }
 
-    ret = gentree(rot, strs, NULL);
+    ret = gentree(rot, strs, NULL, LOOSE_CHECK);
     if (ret < 0) {
         fprintf(stderr, "[-] Failed: could not generate tree\n");
         return -1;
@@ -138,7 +138,7 @@ int main(void) {
     int cnt = 1;
     for (char *tok = strtok(strs_cpy, "\n"); tok != NULL; tok
             = strtok(NULL, "\n")) {
-        int found = streecmp(rot, tok);
+        int found = streecmp(rot, tok, LOOSE_CHECK);
         if (found == cnt) {
             fprintf(stdout, "[+][%d/%d] Success: could find"
                     " '%s' in tree\n", cnt, found, tok);