diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 854ad401207f..32cf64353213 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -2815,8 +2815,9 @@ static bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
         for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
         {
             // Check for valid range. This may also help detect *some* dangling pointers, because a common
-            // user error is to setup ImFontConfig::GlyphRanges with a pointer to data that isn't persistent.
-            IM_ASSERT(src_range[0] <= src_range[1]);
+            // user error is to setup ImFontConfig::GlyphRanges with a pointer to data that isn't persistent,
+            // or to forget to zero-terminate the glyph range array.
+            IM_ASSERT(src_range[0] <= src_range[1] && "Invalid range: is your glyph range array persistent? it is zero-terminated?");
             src_tmp.GlyphsHighest = ImMax(src_tmp.GlyphsHighest, (int)src_range[1]);
         }
         dst_tmp.SrcCount++;
diff --git a/misc/freetype/imgui_freetype.cpp b/misc/freetype/imgui_freetype.cpp
index 68e38ed95b88..d97605b25868 100644
--- a/misc/freetype/imgui_freetype.cpp
+++ b/misc/freetype/imgui_freetype.cpp
@@ -480,8 +480,9 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
         for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
         {
             // Check for valid range. This may also help detect *some* dangling pointers, because a common
-            // user error is to setup ImFontConfig::GlyphRanges with a pointer to data that isn't persistent.
-            IM_ASSERT(src_range[0] <= src_range[1]);
+            // user error is to setup ImFontConfig::GlyphRanges with a pointer to data that isn't persistent,
+            // or to forget to zero-terminate the glyph range array.
+            IM_ASSERT(src_range[0] <= src_range[1] && "Invalid range: is your glyph range array persistent? it is zero-terminated?");
             src_tmp.GlyphsHighest = ImMax(src_tmp.GlyphsHighest, (int)src_range[1]);
         }
         dst_tmp.SrcCount++;