diff --git a/src/utils/units.cpp b/src/utils/units.cpp
index 2c7a1237..deb4aa7c 100644
--- a/src/utils/units.cpp
+++ b/src/utils/units.cpp
@@ -45,6 +45,9 @@ namespace units_utils {
     return static_cast<int>(math_util::percentage_to_value<double, double>(g_format.percentage, max) + offset_pixel);
   }
 
+  /**
+   * Same as percentage_with_offset_to_pixel but capped below at 0 pixels
+   */
   unsigned percentage_with_offset_to_pixel_nonnegative(percentage_with_offset g_format, double max, double dpi) {
     return std::max<int>(0, percentage_with_offset_to_pixel(g_format, max, dpi));
   }
@@ -135,6 +138,11 @@ namespace units_utils {
     return {type, size_value};
   }
 
+  /**
+   * Creates an extent from a spacing value.
+   *
+   * @param spacing Value to convert, must not be SPACE
+   */
   extent_val spacing_to_extent(spacing_val spacing) {
     extent_type t;