diff --git a/Makefile b/Makefile
index b11b8ab..02ad3af 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ RMDIR     := rmdir
 MAKE      := make
 
 SRCDIR    := ./src
-INCDIR    := ./src					    # used by ./test sources
+INCDIR    := ./src                                          # used by ./test sources
 OBJDIR    := ./obj
 BINDIR    := ./bin
 DEPDIR    := ./dep
@@ -34,13 +34,13 @@ BRLIBDIR  := $(BRLIB)/lib
 CCLSROOT  := .ccls-root
 CCLSFILE  := compile_commands.json
 
-SRC       := $(wildcard $(SRCDIR)/*.c)			    # project sources
-SRC_FN    := $(notdir $(SRC))				    # source basename
+SRC       := $(wildcard $(SRCDIR)/*.c)                      # project sources
+SRC_FN    := $(notdir $(SRC))                               # source basename
 OBJ       := $(addprefix $(OBJDIR)/,$(SRC_FN:.c=.o))
 
 TSTSRC    := $(wildcard $(TSTDIR)/*.c)
 
-LIB       := br_$(shell uname -m)			    # library name
+LIB       := br_$(shell uname -m)                           # library name
 LIBS      := $(strip -l$(LIB) -lreadline)
 
 DEP_FN    := $(SRC_FN)
@@ -63,16 +63,16 @@ CPPFLAGS  += -DWARN_ON                                      # brlib bug.h
 #CPPFLAGS  += -DDEBUG_DEBUG                                  # enable log() functions
 #CPPFLAGS  += -DDEBUG_DEBUG_C                                # enable log() settings
 #CPPFLAGS  += -DDEBUG_POOL                                   # memory pools management
-#CPPFLAGS  += -DDEBUG_POS				     # position.c
+#CPPFLAGS  += -DDEBUG_POS                                    # position.c
 #CPPFLAGS  += -DDEBUG_MOVE                                   # move generation
 
 # fen.c
 #CPPFLAGS  += -DDEBUG_FEN                                    # FEN decoding
 
 # attack.c
-#CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS1			     # sq_attackers details
-CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS			    # sq_attackers
-CPPFLAGS  += -DDEBUG_ATTACK_PINNERS			    # sq_pinners details
+#CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS1                      # sq_attackers details
+CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS                       # sq_attackers
+CPPFLAGS  += -DDEBUG_ATTACK_PINNERS                         # sq_pinners details
 
 #CPPFLAGS  += -DDEBUG_EVAL                                   # eval functions
 #CPPFLAGS  += -DDEBUG_PIECE                                  # piece list management
@@ -90,8 +90,8 @@ CFLAGS    := -std=gnu11
 
 # dev
 # CFLAGS    += -O1
-CFLAGS    += -g						    # symbols (gdb, perf, etc.)
-CFLAGS    += -ginline-points				    # inlined funcs debug info
+CFLAGS    += -g                                             # symbols (gdb, perf, etc.)
+CFLAGS    += -ginline-points                                # inlined funcs debug info
 # for gprof
 #CFLAGS += -pg
 # Next one may be useful for valgrind (when invalid instructions)
diff --git a/src/position.c b/src/position.c
index 533ff8f..9a9a81d 100644
--- a/src/position.c
+++ b/src/position.c
@@ -251,10 +251,8 @@ void pos_set_checkers_pinners_blockers(pos_t *pos)
         }
     }
 
-    /* pawns */
+    /* pawns & knights */
     checkers |= bb_pawn_attacks[us][king] & pos->bb[them][PAWN];
-
-    /* knight */
     checkers |= bb_knight[king] & pos->bb[them][KNIGHT];
 
     pos->checkers = checkers;