It would be easier to answer your question if you would have mentioned your mode of investment. Never mind, I will answer for both the types.
Lump Sum- Small cap companies have the highest potential of growth among the mid cap and large cap companies. Thus, when you are investing a lump sum amount in the small cap funds, then make sure that the market valuations are low. Doing so, will help you in buying more number of units at a nominal price and in the future when the market valuations will go high, you can easily sell them at higher prices and enjoy good returns.
SIP- If you have invested in the small cap funds through SIP, then you don’t need to worry about the market timings. Reducing the rupee-cost averaging, SIP may help you in the long term.