diff --git a/System/Utilities/TrueType.HC b/System/Utilities/TrueType.HC
index 75de182..9185ae9 100644
--- a/System/Utilities/TrueType.HC
+++ b/System/Utilities/TrueType.HC
@@ -35,14 +35,15 @@ I32 @stbtt_InitFont(stbtt_fontinfo* info, U8* data, I32 offset)
     }
 }
 
-U8* @stbtt_RenderText(stbtt_fontinfo* info, I32 b_w, I32 b_h, I32 l_h, I32* word)
+U8* @stbtt_RenderText(stbtt_fontinfo* info, I32 b_w, I32 b_h, I32 l_h, I32* word, I32* advance = NULL)
 {
     U64 reg RDI rdi = info;
     U64 reg RSI rsi = b_w;
     U64 reg RDX rdx = b_h;
     U64 reg RCX rcx = l_h;
     U64 reg R8 r8 = word;
-    no_warn rdi, rsi, rdx, rcx, r8;
+    U64 reg R9 r9 = advance;
+    no_warn rdi, rsi, rdx, rcx, r8, r9;
     asm {
         MOV RAX, STBTT_RENDERTEXT
         CALL RAX
diff --git a/src/truetype/truetype.c b/src/truetype/truetype.c
index 32f1a00..964c118 100644
--- a/src/truetype/truetype.c
+++ b/src/truetype/truetype.c
@@ -1,7 +1,7 @@
 #define STB_TRUETYPE_IMPLEMENTATION
 #include "stb_truetype.h"
 
-unsigned char* stbtt_RenderText(stbtt_fontinfo* info, int b_w, int b_h, int l_h, int* word)
+unsigned char* stbtt_RenderText(stbtt_fontinfo* info, int b_w, int b_h, int l_h, int* word, int* advance)
 {
     // https://github.com/justinmeiners/stb-truetype-example
     /* create a bitmap for the phrase */
@@ -45,6 +45,10 @@ unsigned char* stbtt_RenderText(stbtt_fontinfo* info, int b_w, int b_h, int l_h,
         kern = stbtt_GetCodepointKernAdvance(info, word[i], word[i + 1]);
         x += roundf(kern * scale);
 
+        if (advance) {
+            advance[i] = x;
+        }
+
         ++i;
     }