diff --git a/libs/display/EInkDisplay/include/EInkDisplay.h b/libs/display/EInkDisplay/include/EInkDisplay.h
index 2d380ca..10d832f 100644
--- a/libs/display/EInkDisplay/include/EInkDisplay.h
+++ b/libs/display/EInkDisplay/include/EInkDisplay.h
@@ -43,6 +43,7 @@ class EInkDisplay {
 #endif
 
   void displayBuffer(RefreshMode mode = FAST_REFRESH);
+  // EXPERIMENTAL: Windowed update - display only a rectangular region
   void displayWindow(uint16_t x, uint16_t y, uint16_t w, uint16_t h);
   void displayGrayBuffer(bool turnOffScreen = false);
 
diff --git a/libs/display/EInkDisplay/src/EInkDisplay.cpp b/libs/display/EInkDisplay/src/EInkDisplay.cpp
index 962b716..1f7e0ac 100644
--- a/libs/display/EInkDisplay/src/EInkDisplay.cpp
+++ b/libs/display/EInkDisplay/src/EInkDisplay.cpp
@@ -452,6 +452,9 @@ void EInkDisplay::displayBuffer(RefreshMode mode) {
 #endif
 }
 
+// EXPERIMENTAL: Windowed update support
+// Displays only a rectangular region of the frame buffer, preserving the rest of the screen.
+// Requirements: x and w must be byte-aligned (multiples of 8 pixels)
 void EInkDisplay::displayWindow(uint16_t x, uint16_t y, uint16_t w, uint16_t h) {
   Serial.printf("[%lu]   Displaying window at (%d,%d) size (%dx%d)\n", millis(), x, y, w, h);