The invention relates to a signal layer (1) for an absorbent article (9) provided to absorb menstrual fluid where the signal layer (1) comprises a pattern (6) of capillary channels (7) for allowing capillary action such that discharged menstrual fluids that comes across one of the openings in the capillary channels (7) enters into the capillary channels (7) and are retained therein due to the capillary force, wherein the colour of the retained menstrual discharge dyes/colours the pattern (6) for signalling purpose and wherein the pattern (6) is directly or indirectly visible for an observer.
