diff --git a/README.md b/README.md
index b36559c81539c579fe0ece34a2dcfcf1461db1a0..37bb6192f3fa5780e0a5a067df558f3bc2db638c 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ void drawStringMaxWidth(int16_t x, int16_t y, int16_t maxLineWidth, String text)
 
 // Returns the width of the const char* with the current
 // font settings
-uint16_t getStringWidth(const char* text);
+uint16_t getStringWidth(const char* text, uint16_t length);
 
 // Specifies relative to which anchor point
 // the text is rendered. Available constants: